Fix Godawful New Google app icons

fix_google_app_icons.user.js

// ==UserScript==
// @name         Google - restore old favicons
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Google fucked up its icons. This unfucks them. See this tweet: 
//               https://twitter.com/Malcolm_Ocean/status/1316828432483979272
// @author       @Malcolm_Ocean
// @match        https://mail.google.com/*
// @match        https://drive.google.com/*
// @match        https://calendar.google.com/*
// @grant        none
// ==/UserScript==

/* known issues
   - icons could probably be nicer
   - only supports these 3 apps, which are the ones I use (/photos didn't change as much)
   - google calendar no longer has date in icon, but let's face it it's not readable in the new one anyway so,,,
 */
(() => {
  'use strict'
  const hostToIconMap = {
    'mail.google.com': 'https://iconarchive.com/download/i95298/dtafalonso/android-l/Gmail.ico', // 'https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Gmail_Icon.svg/1280px-Gmail_Icon.svg.png',
    'drive.google.com': 'https://www.flaticon.com/svg/static/icons/svg/733/733554.svg',
    'calendar.google.com': 'https://img.icons8.com/color/452/google-calendar.png',
  }
  const iconUrl = hostToIconMap[location.host]

  // querySelectorAll because GCal has multiple elements
  // multiple selectors because different google apps use different attribute
  const faviconElements = document.querySelectorAll('[rel="shortcut icon"], [rel="icon"]')
  faviconElements.forEach(elem => {elem.href = iconUrl})
})()